Malicious PDF — malware analysis report

Static analysis result for SHA-256 c387ceba6c6428b6…

MALICIOUS

PDF

108.3 KB Created: 2021-06-28 21:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fec85204cbccc869e86d5add457c4486 SHA-1: d9a2d684ca43734efbee5c6f519356f8363d5bd1 SHA-256: c387ceba6c6428b6a9e5a5c0f5e1ce61e5a7d42756e18de36b556279632e917b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://abeess.com/userfiles/file/6661198694.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160702509e739f---vutenader.pdfIn PDF document text
    • https://parc-hotel.info/file/77431782043.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/wupilinepasesotikapuri.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d5e7cb8d228059ee2928811a55dd71eb/libuwabalufaka.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/4018456643.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/54950502997.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/lilakegireberirumeve.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/c1t7odv1ffd3j5fr3oiu48iq4m/9254756937.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/7g2bprtukfgu18nd7unma87l85/47085971154.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/40a64fb375366253735dc71acafb8c5d/tokebajafez.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/88111151397.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c8025a4309288bad533097d8da29534e/gozukubamulelivofege.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd6a640997---vadovefivodelafov.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/figavakebaxadafa.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/9280861037.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/50e7pr6df3j6kgktlslbtegq5d/89490022966.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/32833488068.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/aa25e2042194a606f53eea26a06e0ec4/zoxanak.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/21904729427.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4681e90a---xigudipelopiwojepulura.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160764cb922cc2---karuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=humanistic+approach+to+ptsdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D58 10692 bytes
SHA-256: c98dac3560ae355d2fdc78aa6007b41e102572aebad90e4f613dd900d14eb144
font_02_sfnt_off00017593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17593 17760 bytes
SHA-256: 842b821f59070123cdda7b49dfbf3f0cf8e24757932d6553cf358681d335ac47